How to Turn Off All Optimizations/Eliminate SP debug info incorrect warning/etc

YeOldeBDM — Wed, 08 Nov 2006 07:03:37 GMT

Hi. I am using CodeWarrior 3.1 for HCS12.

I am having some problems with promotions to longs, the way certain #define's are taken when their size is not specified, etc mysterious results when an unsigned char member of a structure is a multiplicand versus a standalone unsigned char, understanding what is implementation dependent and what is not, AND ALL THAT GOOD STUFF.

I am experimenting with various snippets of code, and all too often the optimizations are obfuscating what is observed in the debugger.

Is there a way to setup a project so that all optimization is turned off (just for that project) ?

If there is no way to localize the compiler settings to that one project, can someone explain to me how to turn off all the optimizations anyway?

Thanks

Re: How to Turn Off All Optimizations/Eliminate SP debug info incorrect warning/etc

CrasyCat — Wed, 08 Nov 2006 19:27:42 GMT

Hello

The symptoms you are describing are not directly related to optimization but rather to ANSI C standard definition.

You say "promotions to longs, the way certain #defines are taken when their size is not specified".

Please remember that ANSI C standard defines that integral promotion rule apply for arithmetic operation which do not involve a long operand.

That means if you have an assignment as follows:

myLong = myInt1*myInt2;

the expression myInt1*myInt2 will be evaluated on 16-bit and then signed extended to 32-bits.

To make sure the expression is evaluated on 32-bits, you have to cast one of the operands as a long.

This is done as follows:

myLong = (long)myInt1*myInt2;

for operand defined as macro (in a define), just add the suffix L to the constant to make sure it is interpreted as a long.

For example

#define myInt1 10L

If you really want to disable optimization proceed as follows:

- Open the project in the IDE

- Open the Target Settings dialog (Press ALT + F7)

- Switch to "Compiler for HC12" panel

- Click on the "Options" button

- THere are a lot of optimization you can disable there. This will be taken only for the current project.

However note that some optimization cannot be disable at al.

I hope this helps.

CrasyCat

CodeWarrior for MCUのトピックRe: How to Turn Off All Optimizations/Eliminate SP debug info incorrect warning/etc

How to Turn Off All Optimizations/Eliminate SP debug info incorrect warning/etc

Re: How to Turn Off All Optimizations/Eliminate SP debug info incorrect warning/etc